Method and tracking device for tracking movement in a marine environment with tactical adjustments to an emergency response

ABSTRACT

The present invention relates to devices and methods for tracking movement in a marine environment. At least one tracking device that is adapted to be deployed on a surface of the water, wherein the tracking device is capable of moving along the same trajectory of a desired object. Data from the tracking devices are received by at least one satellite, transmitted to a database, and used to determine the forecasted trajectory of the desired object. All data collected from deployed tracking devices may be integrated into a spatial data repository for analysis and reporting using GIS and associated information technologies, thereby allowing for more accurate decision-making and asset deployment during a fluid spill or similar marine contamination event. The present invention also allows for the collection and modeling of accurate localized sea current data, which may assist with marine and coastal engineering works such as shoreline protection and port dredging.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of co-pending U.S. patent applicationSer. No. 13/454,812, entitled Method and Tracking Device for TrackingMovement in a Marine Environment with Tactical Adjustments to anEmergency Response,” filed on Apr. 24, 2012, which claims the benefit ofthe filing date of U.S. Provisional Patent Application No. 61/478,823,filed on Apr. 25, 2011, the disclosures of which are both incorporatedherein by reference in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Embodiments of the invention relate to devices and methods for trackingmovement. More specifically, embodiments of the present invention relateto tracking devices for use in a marine environment, and the utilizationof the tracking devices for marine engineering and design, real-timeoperations monitoring, and emergency response.

2. Description of the Related Art

During a fluid spill emergency, responders need to know two essentialfacts upfront: (1) the exact location and size of the oil slick, and (2)the potential impact of the slick on industrial facilities and sensitiveenvironmental areas. These facts are monitored throughout the durationof the emergency to plan oil containment and recovery efforts, andmonitor the effectiveness of the response efforts. Currently, fluidspill responders gain this information through visual observations andverbal radio reports from in-field support vessels, plus periodicalaircraft flyovers. This approach is subjective and has some fundamentallimitations—especially at night when visibility is effectively zero.Storms and severe offshore weather conditions can also restrict thedeployment of helicopters and pollution control assets, while at thesame time, accelerating the movement of the oil slick via stronger seacurrents.

Along with visual observations, fluid spill responders make extensiveuse of computerized oil slick trajectory models. These simulate theexpected movement and fate of the oil based on complex mathematicalcalculations, scientific assumptions and weather forecasts. Althoughthese models are useful tools, they can never correctly estimate theactual or true path of the oil, due to limitations in both themathematical models and the weather and sea-state forecasts. Althoughscientific prediction helps with “best-guess” tactical planning, thereality of the oil slick's dispersion is what matters.

Previous attempts to monitor oil slicks have utilized rigid and heavy,industrially-fabricated floatation buoys to house electronic trackingdevices, such as those described in U.S. Pat. No. 5,481,904 (Fleck,1996), and U.S. Pat. No. 5,654,692 (Baxter, 1997). Additionally,maritime government agencies and academic institutes have experimentedwith floating tracking buoys for over 3 decades. For example, in 1994,Goodman and Beatty empirically field tested different combinations offloating buoys and electronics packages (see Ron H. Goodman, DebraSimecek-Beatty, and Don Hodgins, Tracking Buoys for Oil Spills,International Oil Spill Conference (1994) available athttp://iosc.org/papers/02212.pdf). Similarly, Garcia-Ladona et. al(2002) tested different “surface drifting floats” to monitor and predictthe movement of the Prestige oil slick off the North Western SpanishCoast (see Garcia-Ladona, Font et al The use of surface drifting floatsin the monitoring of oil spills: the Prestige case, international OilSpill Conference (2005) available atwww.iosc.org/papers_posters/IOSC%202005%20a367.pdf). The goal in allcases is to create a device that will float at the same velocity anddirection as the oil. In reality, none of these devices has achieved thegoal. The monitors used in the prior art have been large rigid,industrially fabricated floating buoys that project a significant amountof surface area above the water level. This surface area results insignificant aerodynamic wind forces that cause such buoys to havevelocities and directions different than that of the sea surface orfluid spilled into the sea.

The prior art has employed expensive, bulky transponders such as ARGOS.Beyond the physical limitations of such buoys, the cost has been abarrier to mainstreaming tracking buoys into the fluid spill responder's‘tool kit’. These prior art spill tracking devices had limited valuebeyond fluid spill tracking due to their size, weight and cost.

The software interfaces and data flows used in the prior art have beenlimited. The raw data has typically been transmitted from the floatingdevice and sent directly to a scientist or technician's laptop computer,where it has been interpreted and made into custom one-off map diagrams.These maps have then been relayed to stakeholders via email orPowerpoint presentations. It is an ad hoc, “grass-roots” approach tocommunication and decision-making which leads to errors and time delays.

It would be beneficial to develop a device that could not only be usefulfor fluid spills, but that could be used in other applications such asdetermining the precise location of fluid spill containment booms, smallsupport vessels or other assets; functioning as a marker buoy to showthe position of live diving operations; locating a life raft at anoffshore facility; and acting as a personal locator attached to a lifevest of workers conducting tasks at hazardous offshore facilities.

Therefore a low-cost, multipurpose solution to address those shortfallswould be desirable.

SUMMARY OF THE INVENTION

The device and method of the current application provides a new,low-cost tool for emergency responders to accurately measure and map theactual movement of sea currents or oil slicks regardless of weather,sea-state, or visibility. Embodiments of the invention enhance both theemergency preparedness and tactical decision making capabilities ofthose who work in a marine environment. This enables fluid spillresponders and management stakeholders to see the exact location andbehavior of the oil slick, and rapidly plan strong contingency measuressuch as sea water intake protection. The solution is low-cost,ruggedized, simple to deploy, and can be integrated with a company'sstandard enterprise information technology systems.

Tracking devices used previously to track sea surface currents and/orspilled fluid were limited due to their size, weight and cost. Theaerodynamic design of prior devices did not facilitate accurate trackingon the sea water surface.

In addition to 24 hour tracking of oil slicks, embodiments of theinvention have potential use in marine search and rescue operations. Forexample, during a man overboard event, one of the devices/tools could bedeployed in the immediate vicinity of the person's last position (e.g.an offshore platform or sinking vessel). The device would travel withand transmit the actual sea currents in a local offshore area. Thiswould enable incident commanders to accurately estimate the local seacurrents and focus rescue resources down current. This could potentiallysave time, resources, and most importantly—lives.

Embodiments of the invention could also be attached to emergency liferafts stationed at offshore oil and gas processing facilities. Thiswould serve as a low-cost and effective locator beacon in the event ofthe raft being deployed.

Beyond the safety applications, embodiments of the invention couldprovide marine supervisors and planners with an accurate overview ofportable offshore assets and operations. For example, the device couldbe used to mark the location of under-sea dive crews doing underwaterwelding at an offshore pipeline or platform. Providing a unifiedmap-based view of all diving operations would encourage optimization ofresources, and could also improve health and safety by improvingawareness of where the crews are operating.

In alternative applications, accurate, local sea current data could beeconomically collected to directly support offshore engineering projectssuch as causeway placement, sea water intake upgrades, sea channeldredging etc. Using live sea surface current data would dramaticallyimprove the accuracy of fluid spill trajectory models and help drivemore accurate tactical decisions and dynamic contingency plans. Thetracking devices could be deployed into the sea during emergency drillsto simulate a moving fluid spill or a man overboard event. Seen mappingwould improve the realism of offshore drills. It would also enable thefluid spill trajectory models or sea surface mapping models to bescrutinized during an integrated scenario, with historic playback duringa post-incident review.

Data collected with embodiments of the present invention could alsosupport the design of marine engineering projects such as upgradingsea-water intakes, or dredging of sea channels. By deploying a number ofthese devices, accurate sea-current data could be collected across anyproject area on several dates to measure and understand circulationpatterns and seasonal variability. Such data is expensive to collectusing conventional approaches.

The device and method of the current application is designed to providelive situational awareness of complex operations taking place in thevast and hazardous marine environment. The system and device is fullywaterproof and can be quickly deployed into the sea to map the locationof oil slicks, people, assets or routine but hazardous operations.Embodiments of the invention uses global positioning systems technologyand satellite communications technology to relay data (location, speed,status, and timestamp) of the oil slick or floating asset at regularintervals, such as every 10 minutes. The tool would securely transmitthat data directly into a designated enterprise's geographic informationsystems (GIS) mapping software applications through traditional intranetsystems. Custom software interfaces securely consolidate the data andpresent it graphically on pre-existing information systems—in particularGIS. Authorized support staff and management stakeholders could thenvisualize the overall location and status of all critical marineoperations on detailed, interactive map displays on their personalcomputers or mobile devices.

In one embodiment, a method for tracking movement in a marineenvironment includes associating a number of tracking devices with afluid spill event and deploying the tracking devices in a fluid spill,where each tracking device transmits its geographic location to a dataprocessing satellite. The method further includes the constantmonitoring of each tracking device's geographical location and velocityto track the movement of the fluid spill over a period of time,determining a forecasted trajectory of the fluid spill based on thesensor-determined movement of the fluid spill over the period of time,and responsively adjusting a spill response based on the forecastedtrajectory.

In another embodiment, a tracking device for tracking movement in amarine environment includes a global positioning system (GPS) unithaving a GPS receiver adapted to receive global positioning signals fromthree or more remote global positioning satellites, the globalpositioning signals being broadcast at a GPS frequency in a range ofabout 1.17-1.58 GHz, a satellite transmitter to send a geographiclocation of the GPS unit to a data processing satellite at a frequencyof around 1.6 GHz, the data processing satellite further transmittingthe geographic location for storage in a positioning satellite datarepository, a processor, operatively connected to the GPS receiver andthe satellite transmitter, adapted to determine the geographic locationof the GPS unit based on the global positioning signals, and a housingadapted to be held by a user of the GPS unit and having the GPSreceiver, the satellite transmitter, and the processor therein. Thetracking device further includes a waterproof container of a flexiblematerial having an interior region adapted to receive the GPS unit andhaving the GPS unit therein, the waterproof container sealable toprevent ingress of fluid and to float the tracking device on the actualsurface of a fluid spill.

In another embodiment, a waterproof container for protecting a globalpositioning system (GPS) unit in a marine environment includes aninterior region adapted to receive the GPS unit and having the GPS unittherein, the interior region including an anterior buoyancy pocket and aposterior buoyancy pocket relative to the GPS unit, a sealing memberthat is sealable to prevent an ingress of fluid and to form the anteriorbuoyancy pocket and the posterior buoyancy pocket, the waterproofcontainer having a volume in a range of around 300-600 mL while sealedwith the GPS unit in the interior region, and a covering of a flexiblematerial defining the interior region, the covering having asubstantially flat upper surface that is adapted to minimize wind dragand water surface displacement while the waterproof container isdeployed in a fluid spill or deployed for scientific recording oflocalized sea surface currents.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features, aspects andadvantages of the invention, as well as others that will becomeapparent, are attained and can be understood in detail, more particulardescription of the invention briefly summarized above can be had byreference to the embodiments thereof that are illustrated in thedrawings that form a part of this specification. It is to be noted,however, that the appended drawings illustrate some embodiments of theinvention and are, therefore, not to be considered limiting of theinvention's scope, for the invention can admit to other equallyeffective embodiments.

FIG. 1 is a schematic view of the tracking system constructed inaccordance with one or more embodiments of the invention.

FIG. 2A is a plan view of the floatation device constructed soaccordance with one or more embodiments of the invention.

FIG. 2B is a side view of the floatation device of FIG. 2A.

FIG. 3 is a schematic view of global positioning system, unit inaccordance with one or more embodiments of the invention.

FIGS. 4A-4B are schematic views of a tracking device in accordance withone or more embodiments of the invention.

FIG. 5 is a method flowchart in accordance with one or more embodimentsof the invention.

FIG. 6 is an example deployment of tracking devices in accordance withone or more embodiments of the invention.

DETAILED DESCRIPTION OF THE DISCLOSURE

As discussed in more detail below, provided in some embodiments aresystems and methods for tracking movement using low-cost trackingdevices, which can be useful for emergency response planning, fluidspill response planning, sea current measurement, or other applicationsin which movement is tracked in a marine environment. In one embodiment,the method for tracking movement in a marine environment includes thesteps of associating a number of tracking devices with a fluid spillevent and deploying the multiple tracking devices in a fluid spill,where each of the multiple tracking devices transmits its exactgeographic location and velocity to a data processing satellite. Themethod further includes monitoring the geographic location of each ofthe multiple tracking devices to track the movement of the fluid spillover a period of time, determining a forecasted trajectory of the fluidspill based on the sensor-determined movement of the fluid spill overthe period of time, and responsively adjusting a spill response based onthe forecasted trajectory.

In one or more embodiments of the invention, the system as shown in FIG.1 comprises one or more tracking device(s) (e.g., 102A, 102N). Apositioning device 104 is configured to provide location informationindicative of the location of the tracking devices (e.g., 102A, 102N).Specifically, the postponing devices 104 may include a satellite ornetwork tower with a signal transmitter configured to provide radiofrequency (“RF”) signals to the tracking devices (e.g., 102A, 102N),where the RF signals allow a tracking device to determine a globallocation of the tracking device. For example, the positioning devices104 may include a global positioning system (GPS), which, includesmultiple satellites that broadcast RF signals and navigation messages.In this example, the RF signals are used by fire tracking devices (e.g.,102A, 102N) to determine the distance to each satellite, and thenavigation messages are used to determine the location of eachsatellite. The distance to and location of each satellite may be used todetermine the global location of a tracking device with the aid of, forexample, triangulation.

The location determined using the positioning devices 104 may betransmitted by the tracking devices (e.g., 102A, 102N) to a dataprocessing device 105. Additional data, such as the speed, bearing andstatus of the tracking device may also be transmitted to the dataprocessing device 105. The data processing device 105, in turn,transmits the collected data to either a data processing repository 106,such as one managed by the satellite operator, or directly to thespatial data repository 110. If the data is transmitted to a dataprocessing repository 106, secure data services 108 relay the data tothe spatial data repository 110. Secure data services 108 may include acustom software module that intercepts the data messages and securelyintegrates them into the spatial data repository 110. The spatial data,repository 110 may be, for example, part of an enterprise GIS system 113that supports fluid spill and emergency response activities at alllevels. Secure data services 108 leverages standard computingenvironments to facilitate ease of integration.

In some embodiments, spatial, data describes the geographic location offeatures (e.g., points of interest, cities, geo-located images, etc.)and boundaries (e.g., rivers, county boundaries, state boundaries,country boundaries, etc.). Typically, spatial data is stored in the formof points, polylines, polygons, vectors, imagery, or some other shape.For example, geographic coordinates and associated metadata for pointsof interest may be stored in a point map layer. Tracking technologiessuch as transponders may be used to report the real-time location ofmoving assets such as large vessels or helicopters. This data may alsobe directly integrated into the GIS system 113 as a dynamic point layer,and co-analyzed with static GIS layers. In another example, boundariesand associated metadata for geographic areas may be stored in a polygonmap layer. Spatial queries may be performed between mapping layers byperforming spatial comparisons (e.g., comparisons for intersections,comparisons for disjointedness, etc.) of the shapes in each of themapping layers. In this case, new information may be derived, such asthe exact distance between a tracking device and a pollution controlvessel at a known location as determined through an automaticidentification system (AIS) transponder. Such derived data can be storedwithin the spatial data repository 110, and relayed to decision makersthrough the GIS system 113.

An application server(s) 112 securely accesses and manipulates the datastored in the spatial data repository 110. The application server(s) 112may load the data into enterprise databases, such as the ORACLE®Database. In one or more embodiments, the application server(s) 112 userobust programming methods and industry standards, such as the JAVA®programming language and libraries, to ensure portability into standardenterprise computing infrastructures. The application server(s) 112 maybe compatible with most large-scale, corporate computing environments,taking little technical support to integrate with current systemstandards. ORACLE® and JAVA® are registered trademarks of OracleCorporation, a corporation organized under the laws of Delaware andheadquartered at 500 Oracle Parkway, Redwood Shores, Redwood City,Calif., United States.

The application server(s) 112 present the data for dynamic display incommercial Geographical Information Systems (GIS) 113 such as ARCGIS®Server and GOOGLE EARTH™ mapping service. For example, the GIS system113 may render a real-time response map for a wall display of a ControlCenter 115 during an emergency response. These advanced mappingtechnologies enable incident responders and executive stakeholders 114to concurrently view the status of offshore operations on a real-time,interactive map display. The live data may be pushed directly toincident commanders and executive stakeholders 114 in a value-addedform, to support tactical decision-making in real-time.

In one embodiment, after deploying the tracking devices around theperimeter and in the approximate center of an oil slick, the data can beremotely monitored in multiple emergency response centers 115, 24 hoursa day throughout the duration of any incident. In other embodiments, thetracking, devices may be deployed in the leading edges, the center, thetrailing edges, and the side flanks of the oil slick for remotemonitoring via a personal computing device(s) or portable mobiledevice(s) 116. ARCGIS™ is a registered trademark of Esri, a privatecompany headquartered in Redlands, Calif., United States. GOOGLE EARTH™is a registered trademark of Google Inc., a corporation organized underthe laws of Delaware and headquartered in Mountain View, Calif. UnitedStates.

In one or more embodiments, the fluid spill may include any combinationof an oil fluid, a chemical composition fluid, and a hydrocarbon-basedfluid. In one or more embodiments, the tracking devices may be used tomeasure, record and map the sea-surface currents without the presence ofany contaminant(s).

In one or more embodiments, the tracking devices (e.g., 102A, 102N) maycommunicate data to each other over a mesh network. For example, atracking device may transmit the positioning signal it receives from thepositioning device(s) 104 to other nearby tracking devices. In thisexample, the positioning signal may then be used by the other trackingdevices to improve their GPS functionality in, for example, bad weatherconditions. In another example, a tracking device (e.g., 102A, 102N)that is unable to communicate with the data processing device 105 maytransmit location data to neighboring tracking devices, which then relaythe location data to the data processing device 105 (i.e., the meshnetwork allows for fault tolerant communications with the dataprocessing device 105).

Turning to FIG. 2A, tracking device 102 (e.g., 102A, 102N) comprises aGPS tracking unit 8. Tracking device 102 is small and light weight, hasa ruggedized design to withstand harsh environmental conditions,provides reliable satellite data transmission, has optimized batteryperformance and power usage, and is low-cost. The power source may be,for example, batteries which are contained within the tracking device102. The power source should be such that the GPS unit 202 remainsactive and operable to report data to the positioning device(s) 104 foran extended period of time, for example, for a number of weeks or anumber of months.

GPS units 202 are commercially available for other dedicated purposes,such as the SPOT SATELLITE GPS MESSENGER™, which has a mass of 209 gramsand is 9.4 cm by 6.6 cm by 2.5 cm. Alternative GPS units 202 may be ofsimilar size or may be even smaller and lighter weight. The SPOTSATELLITE GPS MESSENGER™ may be purchased from retailers for around$100. However, the SPOT SATELLITE GPS MESSENGER™, which is designed fortracking people conducting adventure sports in remote areas, has neverbeen applied to fluid spill or marine asset tracking applications andrequires additional components to be capable of operating as discussedwith respect to the system of the current application. SPOT SATELLITEGPS MESSENGER™ is a trademark of SPOT LLC, a company headquartered inMilpitas, Calif., United States.

Tracking device 102 is enclosed within a waterproof, floating container204 to protect the device from the extremely corrosive effects of seawater and crude oil. In one embodiment, container 204 is a flat andlight (almost weightless), envelope-shaped bag. The tracking device 102represents a significant design change from the traditional circular or‘flower pot’ shaped tracking buoys of poor embodiments. The outercovering of the container 204 may be made of a flexible but waterresistant material such as a polyurethane plastic. Such a design ofcontainer 204 minimizes both water surface displacement and wind and seacurrent ‘drag’ and gives the tracking device(s) (e.g., 102A, 102N) amore consistent trajectory. Specifically, in some embodiments, thecontainer 204 may have (1) a substantially flat upper surface that isadapted to minimize wind drag and water surface displacement and (2) asubstantially flow lower surface that is adapted to minimize sea currentdrag. For example, the container 204 may be envelope shaped such thatthe perimeter of the container 204 tapers to an edge around the GPS unit202 therein. In this case, the envelope shape of the container 204 helpsensure that the container 204 more closely follows sea currents.

In some embodiments, container 204 has an opening on one end to receivethe tracking device 102. The opening is sealed closed with sealingmember 206, which prevents the flow of fluids into the interior ofcontainer 204. Container 204 may be low profile, such that when deployedon the surface of the water, the entire tracking device 102 is at ornear the surface of the water. Tracking device 102 should not project asignificant distance either above or below the surface of the water.This allows for accurate representation of the movement of the surfacelayer of the water or the movement of other fluids floating at thesurface of the water, such as crude oil. In one embodiment, thethickness, or profile, of tracking device 102 is less than 2.5 cm.

As seen in both FIG. 2A and FIG. 2B, a custom designed floatingcontainer 204 may be used and designed with the weight, weightdistribution, and aerodynamic properties such that when combined withtracking device 102, the movement of the tracking device 102 correspondsto the movement of the desired object to be emulated. Alternatively, acommercially available container 204 may be used, such as Kwik Tek's DRYPAK®. Because tracking device 102 is low weight and has a slim profile,there is minimal water displacement or wind drag and tracking device 102may follow the movement of a desired object without further alteration.Alternatively, tracking device 102 may be ballasted to float at the samevelocity and in the same direction as the desired object. Depending onthe application of the tracking device, the desired object may be, forexample, the sea surface itself, a contaminant floating on the seasurface such as a fluid spill or a toxic algal bloom. DRY PAK® is aregistered trademark of Kwik Tek Inc., a corporation organized under thelaws of Colorado and headquartered at 16163 W. 45th Dr. Unit D., Golden,Colo. 80403.

If ballast is required, ballast (not shown) may be added to container204 so that the tracking device 102 floats at the same velocity and inthe same direction as a sea surface, target crude oils, or other desiredobjects, as applicable, in a range of weather conditions. The ballastmay also be situated so that the tracking device 102 remains upwardsfacing to maximize satellite communications capabilities. Ballast may beadjusted depending on the crude oil grades, weather, and sea-stateconditions. The ballast is placed within container 204 and is removable,adjustable and providing a snug fit in the container 204. Ballastingmaterial may include a variety of materials including air, densepellets, or a rubberized material which encases Tracking device 102. Forexample, the ballast may comprise: two small “C” shaped molds of cementor similar composite material, placed at each end of container 204; twoor more small metal blocks placed and balanced at each end of container204; an optimal number of small lead balls; a small volume of beachsand, spread evenly across the container 204; or some combination ofthese or other useable ballast materials. When using smaller grainedloose material for ballast, such as sand or lead balls, the ballastmaterial may have the added benefit of moving slightly with the waves tocompensate for the forces acting on the water surface.

The tracking device 102 used for test purposes had a mass of 174 gramsand measured approximately 18 cm by 10 cm by less than 2.5 cm thick. Thetotal cost of the test tracking device 102 was less than $300 retail forthe hardware components. At such a low cost, many dozens of trackingdevices (e.g., 102A, 102N) may be adapted to be economically deployedaround the entire perimeter, as well as at the approximate center, of afluid spill. In an oil spill, the lighter oils travel more quickly andthus are present at the leading edges of a spill, and the heavier oilsremain closer to the center or near the trailing edges of a spill.Deploying multiple tracking device(s) (e.g., 102A, 102N) at theperimeter as well as near the approximate center of the oil slickprovides a statistically and physically realistic delineation of theslick's shape and its movement patterns. This would, in turn, drive moreaccurate tactical decision-making by the incident commanders andexecutive stakeholders 114. The low cost and small size of trackingdevices (e.g., 102A, 102N) allow for the deployment ofmultiple—potentially even hundreds—of tracking devices (e.g., 102A,102N) in this manner.

In operation, a number of tracking devices (e.g., 102A, 102N) may bekept on-hand at a marine vessel, project or work-place. During anemergency or exercise, the workers could insert the power supply intothe tracking device 102 then rapidly activate the tracking device 102,for example by pushing an “on” button. The GPS units 202 arepre-configured to securely communicate with positioning device(s) 104 sothere are no other steps required to prepare the tracking device 102.The one or more tracking devices (e.g., 102A, 102N) are then ready to bereleased in a marine environment, directly onto the sea surface. In oneembodiment, multiple tracking devices (e.g., 102A, 102N) may be loadedon a helicopter and dropped around the entire perimeter of, as well asin the approximate center of, a fluid spill. In alternative embodiments,such as when gathering sea current data or during a man overboard event,either real, or for training purposes, a single tracking device(s)(e.g., 102A, 102N) may be adapted to be deployed at the sea surface at adesired starting point. Alternatively, the tracking devices (e.g., 102A,102N) could be adapted to be deployed from the side of a vessel.

If during a long term event, the tracking devices (e.g., 102A, 102N) mayneed to be re-positioned. In this case, the tracking devices (e.g.,102A, 102N) can be retrieved from a vessel and re-deployed at anotherlocation. Redeployment may be required, for example, if the trackingdevices (e.g., 102A, 102N) have separated from the oil slick. In thiscase, the ballast in container 204 may be adjusted before re-deployingthe tracking device 102 so that the movement of tracking device 102better corresponds to the movement of the oil slick within prevailingsea and weather conditions. Because the tracking devices (e.g., 102A,102N) use GPS technology, they could be rapidly located, day or night,for retrieval or re-positioning.

The tracking device 102 may have been pre-ballasted to match themovement in the sea of the desired object such as the sea surface orcrude oil. The amount of ballast and its location within container 204is determined by taking into consideration such things as the crude oilgrades, weather, and sea-state conditions, as applicable. Alternatively,the low weight and slim profile of the tracking devices (e.g., 102A,102N) may be such that no ballast is required for them to match themovement of the desired object.

After activating and releasing the required number of tracking devices(e.g., 102A, 102N), the tracking devices (e.g., 102A, 102N) may beginreceiving a positioning signal from the positioning device(s) 104. Forexample, the positioning signal may correspond to a GPS signal receivedfrom a GPS satellite, where the GPS signal is used to determine thelocation, speed, and bearing of the tracking devices (e.g., 102A, 102N).The location, speed, and bearing may then be transmitted from trackingdevices (e.g., 102A, 102N) to a data processing device 105. The dataprocessing device 105 may be a satellite configured to relay the datareceived from the tracking devices (e.g., 102A, 102N). Transmitted datamay also include the status of the tracking device (i.e., dataindicating whether the device is operating properly) and a precisetimestamp when each measurement was recorded. The transmitted data maybe gathered in regular short intervals, such as every 10 minutes.

Data processing device 105 then transmits the collected data to either adata processing repository 106 or directly to the spatial datarepository 110. If the data is transmitted to a data processingrepository 106, secure data services 108 may relay the data to thespatial data repository 110. Application server(s) 112 securely accessand manipulate the data received by the spatial data repository 110. Theapplication server(s) 112 present the data for dynamic display throughreal-time GIS systems 113. The data can be remotely monitored inmultiple emergency response centers 115, 24 hours a day throughout theduration of the event to allow for accurate tactical decision-making bythe incident commanders and executive stakeholders 114.

At the completion of the event or if the power sources of the torchingdevices (e.g., 102A, 102N) are nearly depleted, the tracking devices(e.g., 102A, 102N) are retrievable. The power sources, internalbatteries for example, can be replaced or recharged and the trackingdevices e.g., 102A, 102N) may be used again immediately, or stored to beused for a future event. If there is an extended period of time betweenthe retrieval of the tracking devices (e.g., 102A, 102N) and theirre-deployment, the power source may be removed from the tracking device102 to avoid potential corrosion.

If the tracking device 102 has been deployed in a fluid spill orsimilarly potentially damaging environment, the container 204 may beproperly disposed and a new container 204 provided for the trackingdevice 102. If the tracking device 102 has been deployed in anuncontaminated marine environment, the container 204 may be re-used anumber of times and replaced only when the end of its useful life hasbeen reached, which may vary depending on such factors as its prolongedexposure to sunlight, high temperatures, high humidity and highly salinewater.

During extensive field trials of the tracking device 102, the container204 was left floating for weeks in highly saline water contaminated withoil, in 45° F. ambient air temperature and direct daylight. Thecontainer 204 exhibited no signs of deterioration. Because the fieldtested tracking device 102 were enclosed in strong marine-gradeplastics, the container 204 was able to withstand extreme environmentalconditions.

FIG. 3 shows a GPS unit 202 in accordance with certain embodiments. TheGPS unit 202 shows a housing 302 that encloses a controller 304, a GPSreceiver 306, a transmitter 308, a battery 310, and a user interface312. As discussed above, the GPS unit 202 may be a SPOT SATELLITE GPSMESSENGER™, which has a housing 302 that is adapted to be held in asingle hand of the user of the (GPS unit 202. The housing 302 mayinclude rigid materials such as plastic, steel, aluminum, etc. on whicha circuit board (not shown) including the components is mounted. In someembodiments, the housing 302 may be wholly sealed and water-proofedthereby allowing the GPS unit 202 to operate in harsh environments andconditions.

The controller 304 may include one or more central processing units(processors) configured to control the GPS receiver 306, the transmitter308, and the user interface 312. For example, the controller 304 may bea microcontroller including a processor core and memory. In this case,the processor(s) of the microcontroller are configured to operate theGPS receiver 306, the transmitter 308, and the user interface 312according to program instructions stored in the memory.

The GPS receiver 306 is configured to receive GPS signals from three ormore GPS satellites. As discussed above, the GPS signals may be used toaccurately determine the current geographic location of the GPS unit202. In some embodiments, the GPS receiver 306 may include a separateprocessor to determine the geographic location of the GPS unit 202 basedon the GPS signals. Alternatively, the microcontroller 306 may determinethe geographic location of the GPS unit 202 based on the positioningsignals received from the GPS receiver 306. The GPS receiver 306 isconfigured to receive GPS signals at a satellite frequency of 1.17-1.58GHz. Specifically, GPS signals are typically broadcasted by GPSsatellites 104 of FIG. 1 at 1.57542 GHz and 1.2276 GHz.

The transmitter 308 is configured to transmit location data (e.g.,geographic location determined using the GPS signal) to a commercialsatellite 105 of FIG. 1. For example, the transmitter 308 may be asimplex transmitter unit, which is compact satellite module configuredto communicate with commercial satellites 105 of FIG. 1. In thisexample, the commercial satellite 105 of FIG. 1 may be a low earth orbitsatellite in the GLOBALSTAR™ constellation, which is used for satellitephones and low-speed data communications. When communicating with theGLOBALSTAR™ constellation, the transmitter 308 may be configured to sendthe location data at a frequency of 1610-1626 GHz. As discussed above,the commercial satellite 105 of FIG. 1 may then relay the location datafor storage in a data processing repository 106 of FIG. 1 or spatialdata repository 110 of FIG. 1. GLOBALSTAR™ is a trademark of GlobalStar,Inc., a company headquartered in Covington, La., United States.

In some embodiments, the GPS unit 202 may also include a localtransmitter (not shown) configured to communicate with nearby GPS unitsvia a mesh network. The local transmitter may use radio frequencysignals (e.g., WI-FI™ BLUETOOTH®, etc.) to allow the GPS unit 202 tocommunicate directly with other GPS units. The local communication maybe performed for a variety of reasons including enhancing GPSfunctionality, fault tolerance in communicating location data to thecommercial satellite (105 of FIG. 1), etc. WI-FI™ is a trademark of theWi-Fi Alliance, a trade association based on Austin, Tex., UnitedStates. BLUETOOTH® is a registered trademark of Bluetooth SIG, Inc., aprivately held, not-for-profit trade association headquartered inKirkland, Wash., United States.

The power supply 310 provides operating power to the control 304, theGPS receiver 306, and the transmitter 308. For example, the power supply310 may include standard AA or AAA lithium ion batteries that aremaintained as needed during deployment of the GPS unit 202. The powersupply 310 may also include a sensor to detect the current charge levelof the batteries. In some embodiments, solar cells may be used toactively charge or even fully power the GPS unit 202.

The user interface 312 is configured to receive input or provide outputfor a user of the GPS unit 202. The user interface 312 may includelight-emitting diode (LED) notification lamps that notify the user ofthe status of various components (e.g., low battery indicator, GPSconnection status, etc.) of the GPS unit 202. The user interface 312 mayalso include buttons that allow the user to provide commands to the GPSunit 202. For example, the user interface 312 may include an SOS buttonthat once pressed by the user, instructs the GPS unit 202 to send adistress signal including the precise geographic location of the GPSunit 202 to the commercial satellite 105 of FIG. 1. In this example, theGPS unit 202 may be affixed to response personnel participating in anemergency response or other oil-related activity, where the distresssignal may be denoted on a real-time GIS map generated by the GIS system113 of FIG. 1 based on location data obtained from the GPS unit 202. Inanother example, the user interface 312 may include a power button thatmay be used to activate the GPS unit 202 prior to deployment and then todeactivate the GPS unit 202 after an incident (e.g., oil spill) has beenresolved.

FIGS. 4A and 4B show cross sectional, side views of a tracking device102 in accordance with certain embodiments. In FIG. 4A, the trackingdevice 102 is shown as deployed on a surface of a fluid 401 (e.g.,seawater, oil spill, etc.). The cross section shows the GPS unit 202 inthe interior region of the container 204, where the thickness 402 of thetracking device 102 is defined by the placement of the GPS unit 202 inthe container 204. Further, a posterior buoyancy pocket 406 and ananterior buoyancy pocket 408 are formed by the placement of the GPS unit202 in the container 204 after the sealing member 206 is sealed,trapping a volume of air inside buoyancy pockets 406, 408.

The buoyant force 410 acting on the tracking device 102 may bedetermined based on the depth 404 of the tracking device 102 in thefluid 401. In FIG. 4A, the posterior buoyancy pocket 406 and theanterior buoyancy pocket 408 contain air resulting in relatively lessbuoyant force 410 in comparison to a tracking device having weightedballast (102 of FIG. 4B). For example, the buoyant force 410 acting onan example tracking device 102 with a mass of 174 grams is around −1.74N. TABLE 1 below shows the volume of fluid displaced by the exampletracking device 102 with a mass of 174 grams in varying grades of crudeoil and in seawater when the example tracking device 102 achieves abuoyant force of around −1.74 N.

TABLE 1 fluid volumes displaced by example tracking device when deployedDensity of Fluid Displaced Vol. Fluid (g/mm³ at 16° C.) of Fluid (mL)Crude oil, 48° API 0.790 224 Crude oil, 40° API 0.825 215 Crude oil,35.6° API 0.847 209 Crude oil, 32.6° API 0.862 205 Crude oil, California0.915 193 Crude oil, Mexican 0.973 182 Crude oil, Texas 0.873 203Seawater 1.020 174

TABLE 1 shows that the volume displaced by the example tracking device102 to achieve a buoyant force of −1.74 N increases as the density ofthe fluid 401 decreases. In other words, the depth 404 of the trackingdevice 102 in the fluid 401 increases as the density of the fluid 401decreases. An example tracking device 102 with a length of 175 mm, awidth of 100 mm, and a thickness of 25 mm has a volume of about 300-350mL. The depth 404 of the tracking device 102 in the fluid 401 affectsthe trajectory of the tracking device 102. In order to match thetrajectory of the tracking device 102 to a target fluid 401 (e.g., crudeoil in an oil spill), ballast may be used as shown in FIG. 4B.

The volume and mass of the tracking device 102 may vary depending on theGPS unit 202 and container 204 used. For example, a SPOT PersonalTracker having a height of 11.1 cm, a width of 6.9 cm, a thickness of4.4 cm, and a mass of 209 g may be used as the GPS unit 202, In thisexample, the tracking device 102 would have a volume of about 500-600mL.

In FIG. 4B, posterior ballast 414 and anterior ballast 416 are containedin the buoyancy pockets 406, 408 of the tracking device 102. The ballast414, 416 is shown as “C” shaped molds. In this example, the trackingdevice 102 is thicker at the posterior buoyancy pocket 406 than at theanterior buoyancy pocket 408 due to the shape of the GPS unit 202.Accordingly, in FIG. 4B, the anterior ballast 416 is thinner to betterfit the top portion of the GPS unit 202 when placed in the container204. Despite the difference in size, the posterior ballast 414 and theanterior ballast 416 may have substantially equivalent masses such thatbalance is maintained on the ends of the container 204, thereby ensuringthe trajectory of the tracking device 102 better matches the trajectoryof the target fluid 401.

In some embodiments, the ballast 414, 416 may be configured according toa variety of environmental factors such as sea currents, wind directionand velocity, water temperature, surface pressure, type of fluid, etc.For example, the amount of ballast 414, 416 may be determined accordingto the grade of the crude oil. In this example, as the density of thecrude oil decreases, less ballast 414, 416 may be used in order tomaintain the same depth 404 of the tracking device 102 in the fluid 401.

FIG. 5 shows a method flowchart in accordance with certain embodiments.More specifically, FIG. 5 is a flowchart of a method for trackingsurficial movement in a marine environment. The movement of a fluidspill may be tracked for a fluid spill response or for other purposes.As is the case with the other processes described herein, variousembodiments may not include all of the steps described below, mayinclude additional steps, and may sequence the steps differently.Accordingly, the specific arrangement of steps shown in FIG. 5 shouldnot be construed as limiting the scope of the invention.

In 502, initial data for a reported fluid spill is obtained. The initialdata may include an initial location, a known oil type, an estimatedvolume, and an estimated slick size of the fluid spill. The initial datamay be determined based on visual observations, aerial reconnaissance,vessel log data, etc. Once the initial data for the reported fluid spillis obtained, a spill response team may be deployed to the initiallocation of the fluid spill.

In 504, tracking devices are deployed at the fluid spill based on theinitial data. More specifically, the spill response team may deploy thebacking devices at or near the initial location of the fluid spill usingvisual cues (e.g., oil sheen) and environmental factors such as oceancurrents. For example, the spill response team may deploy a first set oftracking devices in the center of the fluid spill, a second set oftracking devices in the leading edges of the fluid spill, a third set oftracking devices in the trailing edges of the fluid spill, and a fourth605 and fifth set 609 of tracking devices on both the outer flanks ofthe fluid spill to represent the width of the spill. Each of thetracking devices has a unique device identifier that is associated withthe fluid spill before or during deployment. The unique deviceidentifier may also be associated with the initial deployment zone(e.g., center, leading edges, trailing edges, etc.) of the correspondingtracking device. In some embodiments, the tracking devices may bedeployed from a helicopter traveling over the fluid spill.

In some embodiments in 504, one or more tracking devices may also bepreemptively deployed at a relevant distance ahead of the fluid spill'sleading edge—for example, mid-way between the present location of thespill and the predicted shoreline landing point of the fluid spill.Tracking devices deployed for such analysis would be configured with ameaningful identifier code to differentiate them from other trackingdevices deployed within the actual fluid spill. In this case, thepreemptively deployed tracking devices could be tracked and rendered inthe GIS system 113 of FIG. 1 to provide dynamic maps showing an earlyindication of the most likely shoreline contact points, assumingprevailing sea and weather conditions remain relatively constant. Suchstrategic insight may be invaluable to incident commanders and executivestakeholders 114 of FIG. 1, allowing them to optimize the preparation ofshoreline protection measures such as containment booms (e.g., oil spillcontainment boom, chemical spill containment boom).

In 506, position, heading, and speed data is collected by the trackingdevices along with the unique device identifier and a precise timestampfor each reading. Each of the tracking devices may be configured toperiodically (e.g., every 10 minutes, etc.) determine its geographiclocation, heading, and speed based on location signals received from apositioning device (e.g., GPS satellite, network tower, etc). Once thedata is determined by a tracking device, the position, heading, andspeed data may be transmitted to a data processing satellite, which maythen relay the data for eventual incorporation into a spatial datarepository.

In 508, a GIS map 113 is generated showing a real-time location andlikely path (i.e., forecasted trajectory) of the fluid spill using thespatial data repository. The real-time location of the fluid spill maybe calculated and modeled using advanced geo-statistical modelingtechniques such as a concave bull algorithm. Alternatively thegeographic center of fluid spill could be simplistically determined bystatistically averaging the geographic locations of all the trackingdevices deployed in the fluid spill in 504. For example, the geographiccenter of the tracking devices may be determined by calculating thecentroid (e.g., center of gravity, equilibrium point, etc.) of thegeographic locations.

In some embodiments, the concave hull process may be used to generate aconcave hull polygon that closely approximates the location and shape ofa fluid spill. In this case, the set of points from the tracking devicesdeployed in the fluid spill may be used to generate the concave hullpolygon. For example, a concave hull process may be based on a k-nearestapproach that classifies each point in the set of points based on themajority vote of its neighbors. In this example, different selections ofk may be made to generate various concave hull polygons (e.g., a highernumber k results in a smoother polygon). The k-nearest approach isdescribed in Adriano et al., Concave hull: a k-nearest neighboursapproach for the computation of the region occupied by a set of points,INSTICC Press published on Mar. 8, 2007, which is incorporated byreference herein in its entirety.

In another example, the concave hull process may be based on a shavingexterior edges approach. An exemplary algorithm for the shaving exterioredges approach is described below:

Generate the Delaunay triangulation of the set of points P.

Remove the longest exterior edge from the triangulation such that (1)the edge removed is longer than a length parameter 1 and (2) theremaining exterior edges of the triangulation form a simple polygon

Repeat removing the longest exterior edge so long as there are edgesthat satisfy the criteria above.

Return the polygon formed by the exterior edges of the triangulation.

The shaving exterior edges approach is described in Duckham et al.,Efficient generation of simple polygons for characterizing the shape ofa set of points in the plane, Pattern Recognition v41 published on Jan.11, 2008, which is incorporated by reference herein in its entirety.

In other embodiments, the position and velocity of the forward orleading tracking devices could be used to represent the presenttrajectory and velocity of the spill. The location and trajectory of anypreemptively deployed sensors may also be rendered by the GIS system 113of FIG. 1 for display on GIS map displays.

In some embodiments in 508, the GIS system 113 of FIG. 1 may alsovisually render the present trajectory of the fluid spill as a singlevector which is dynamically updated by summing the average velocity ofall tracking devices deployed in the spill at any time period. In oneembodiment, the vectors showing the present trajectory of the fluidspill are stored within the spatial data repository 110 to enableanalysis and visualization of recent trajectory changes in the GISsystem 113 of FIG. 1.

The likely path of the fluid spill may be determined by modeling themovement of the oil in a body of water such as an ocean. In this case,the likely path of the fluid spill may be modeled based on the historicpath of the fluid spill as accurately determined by the tracking devicesand a variety of environmental factors such as sea currents, winddirection and velocity, water temperature, surface pressure, etc.Because the tracking devices float ubiquitously on the sea surface withthe oil, the tracking devices' movement and velocities collectivelyprovide a detailed physical view of the prevailing sea and weatherconditions.

In one or more embodiments, the reliance on 2D and 3D trajectory modelsis reduced. However, trajectory models such as the Parallel OceanProgram, a three-dimensional ocean circulation model developed byresearchers at the Los Alamos National Laboratory, may still be utilizedto forecast longer-term “what if” scenarios that incorporate externaldata sources such as 5-day weather forecasts. In this case, the datafrom actively deployed tracking devices is imported directly into the 2Dor 3D trajectory models to significantly improve their resolution andstatistical reliability.

In 510, the positions of fire tracking devices are collectively verifiedwith visual observations obtained by aerial flyovers and/or vessel-basedobservations. More specifically, the aerial flyovers may providegeo-referenced imagery of the fluid spill, which may be overlaid on thegeographic locations of the tracking devices in the GIS map display 113generated in 508. Wayward tracking devices no longer inside theperimeter of the fluid spill may be identified using the GIS map and theaerial imagery. Wayward tracking devices may also be discovered throughdynamic, statistical correlation between the position and velocity ofall tracking devices deployed within a given spill. For example, if oneor more tracking devices were to significantly decelerate or evenreverse their bearing, it may indicate a fault with the GPS receiver 306of FIG. 3 or controller 304 of FIG. 3 of the GPS unit 202 of FIG. 3.Such a situation would warrant immediate extraction and replacement withanother tracking device.

In 512, a determination is made as to whether there are any waywardtracking devices. If there is a wayward tracking device, the waywardtracking device is retrieved and redeployed inside the perimeter of thefluid spill in 514. While redeploying the tracking device, the trackingdevice may also be maintained (e.g., replace battery, modify ballast,etc.) to ensure continued operation of the device. For example, theballast may be adjusted so that the tracking device remains within thefluid spill perimeter.

In 516, a determination is made as to whether a low battery notificationhas been received from any of the tracking devices. If a low batterynotification has been received from a tracking device, the trackingdevice is retrieved and maintained to ensure continued operation of thedevice before redeploying the tracking device into the fluid spill in514.

In 518, a determination is made as to whether an impact notificationwarning has been received from any of the tracking devices, eitherpreemptively deployed, or deployed within the actual spill. An impactnotification warning may be generated when it is determined, that any ofthe tracking devices is within a predetermined distance of a criticallocation. Examples of critical locations may include water intakes,seaports, beaches, sensitive marine habitats, etc. If an impactnotification warning has been received for a tracking device, the fluidspill response may be modified based on the impact notification warning520. For example, spill response assets or personnel may be deployed tothe geographic location of the tracking device associated with theimpact notification warning. In this example, the spill response assetsand personnel may also be equipped with tracking devices such that theirlocations are automatically included in the GIS map display rendered bythe GIS system 113 of FIG. 1 in 508. This live and comprehensivetactical awareness allows nearby assets and personnel to be optimallypositioned based on the impact notification warning.

In some embodiments, one or more tracking devices may be attached todeployed oil containment booms in order to track the location andphysical configuration of the booms during a fluid spill response. Forexample, a tracking device may be attached to the middle of a boomthereby allowing the general location of the boom with respect to thefluid spill to be depicted on a map. In another example, a trackingdevice may be attached to each end of the boom thereby allowing thelength and extent of the boom to be depicted on a map. Adding moretracking devices along the edge of the boom at intervals would enablethe exact configuration of the boom to be accurately depicted in thelive GIS map display rendered by the GIS system 113 of FIG. 1. In eithercase, the map depicting the position of the boom may be used to deploythe boom in a down-current position of the likely path of the fluidspill. The low cost of the envisioned tracking device supports a newlevel of data collection and deep tactical awareness.

In one or more embodiments, other tactical or operational notificationsmay be generated based on data obtained by the tracking devices. Forexample, the velocity of the tracking devices may be monitored andtransmitted for storage in the spatial data repository. In this example,a sea-conditions notification may be generated if the average velocityof the tracking devices changes by a predetermined percentage. Thechange in average velocity may indicate that there is a significantchange in sea conditions. Similar to as discussed above in 520, thefluid spill response may be responsively adjusted in direct response toa sea-conditions notification.

In one or more embodiments, a smaller spill response vessel (e.g. afishing vessel) that is enlisted to assist with the spill response maybe temporarily equipped, with a tracking device for monitoring alocation of that vessel. The use of low cost tracking sensors in thismanner could supplement the use of automatic identification system (AIS)transponders, which all large marine vessels are required to carry byinternational maritime law. Using this hybrid tracking approach, thelocation of all vessels and assets involved in the response could becollectively displayed in the live GIS map display rendered by the GISsystem 113 of FIG. 1.

In this case, the location of the vessel as determined by the trackingdevice could also be used to verify a live vessel position as determinedby an automatic identification system transponder on the largersea-craft.

In 522, the spill response may be modified based on the GIS mapgenerated in 508. For example, spill response assets or personnel may bedeployed based on the movement of the fluid spill shown in the GIS map.

In 524, a determination is made as to whether the fluid spill incidentis resolved. If the incident is not resolved, the method may continue to506. If the incident is resolved, the method may end. At this stage, thetracking devices may be retrieved and prepared for storage (e.g.,disassembled, batteries removed, cleaned, etc.) until the devices areneeded for a subsequent fluid spill or other sea surface data collectionmission.

FIG. 6 shows a number of tracking devices deployed in a fluid spill 603.In this example, the fluid spill 603 is shown as moving to the northwestdue to sea currents 601. A tracking device 602 is deployed in the centerof the fluid spill 603. Further, five tracking devices 604, 606 aredeployed in the leading edge of the fluid spill 603, and five trackingdevices 608, 610 are deployed in the trailing edge of the fluid spill603. Another three tracking devices 605 are deployed to delineate thewestern edge or flank of the slick. Similarly, three tracking devices609 are deployed to track the eastern flanking edge. In someembodiments, any number of additional tracking devices may be deployedalong the perimeter of the fluid spill 603.

In FIG. 6, a tracking device 606 is shown that is unable to connect tothe commercial satellite (105 of FIG. 1) in order to transmit locationdata. In this case, the tracking device 606 may form a mesh network withnearby tracking devices 604, where the location data is transmitted to aneighboring tracking device 604 that relays the location data to thecommercial satellite (105 of FIG. 1). The mesh network allows thetracking devices 604, 606 to be somewhat fault tolerant in the eventthat one of the tracking devices 606 is unable to connect to thecommercial satellite (105 of FIG. 1).

A wayward tracking device 610 is also shown outside the perimeter of thefluid spill 603. The wayward tracking device 610 may be identified basedon location data provided by the wayward tracking device 610, where thegeographic location of the wayward tracking device 610 is outside theperimeter of the fluid spill 603 as shown in aerial imagery. In thiscase, the wayward tracking device 610 may be retrieved and redeployed inthe perimeter of the fluid spill 603 as discussed above.

Because the tracking devices 602, 604, 606, 608, 610 are low cost, arelatively large number of tracking devices 602, 604, 606, 605, 610 maybe deployed in the fluid spill 603. Using the location data from all ofthe tracking devices 602, 604, 606, 608, 610; the geographic location ofthe oil spill may be more accurately determined in real time as aconcave hull polygon 611, which encapsulates all tracking devices 602,604, 606, 605, 608, 609, 610.

In some embodiments, the average velocity and direction of all sensorsdeemed valid may be constantly calculated and dynamically represented asa single spill vector 612. The spill vector 612 constantly changes asnew sensor readings are inserted into the spatial data repository 110 ofFIG. 1. The spill vector 612 is displayed on the live GIS map displayrendered by the GIS system 113 of FIG. 1, where the spill vector 612 maybe analyzed and displayed with previous spill vectors to gauge theoverall progression of the spill over selected timespans.

This invention and this application relate to co-pending U.S.Non-provisional patent application Ser. No. 13/454,812, by O'Regan etal, titled “Method, System, and Machine to Track Fluid Spills WhenMoving With Water Flow,” filed on Apr. 24, 2012, incorporated byreference herein in its entirety.

Although the present invention has been described in detail, it shouldbe understood that various changes, substitutions, and alterations canbe made hereupon without departing from the principle and scope of theinvention. Accordingly, the scope of the present invention should bedetermined by the following claims and their appropriate legalequivalents.

The singular forms “a”, “an” and “the” include plural referents, unlessthe context clearly dictates otherwise. Optional or optionally meansthat the subsequently described event or circumstances may or may notoccur. The description includes instances where the event orcircumstance occurs and instances where it does not occur. Ranges may beexpressed herein as from about one particular value, or to about anotherparticular value. When such a range is expressed, it is to be understoodthat another embodiment is from the one particular value or to the otherparticular value, along with all combinations within said range.

Throughout this application, where patents or publications arereferenced, the disclosures of these references in their entireties areintended to be incorporated by reference into this application, in orderto more fully describe the state of the art to which the inventionpertains, except when these reference contradict the statements madeherein.

That claimed is:
 1. A method for tracking movement in a marineenvironment, the method comprising: associating a plurality of trackingdevices with a fluid spill event; deploying the plurality of trackingdevices in a fluid spill, each tracking device of the plurality oftracking devices transmitting a geographic location of the trackingdevice to a data processing satellite; monitoring the geographiclocation of each tracking device of the plurality of tracking devices totrack the movement of the fluid spill over a period of time; determininga forecasted trajectory of the fluid spill based on the movement of thefluid spill over the period of time; adjusting a spill response based onthe forecasted trajectory; attaching an asset-tracking device to a spillresponse asset; deploying the spill response asset based on theforecasted trajectory of the fluid spill; and monitoring the assetlocation of the spill response asset using the asset-tracking device. 2.The method as claimed in claim 1, wherein the spill response asset is acontainment boom, the asset-tracking device being attached to a middleportion of the containment boom, and wherein the containment boom isadapted to be deployed in a down-current position of the forecastedtrajectory of the fluid spill.
 3. The method as claimed in claim 1,further comprising: obtaining geo-referenced aerial imagery of the fluidspill that is captured by flyover reconnaissance; identifying a waywarddevice of the plurality of tracking devices that is outside a perimeterof the fluid spill based on the geo-referenced aerial imagery; andredeploying the wayward device inside the perimeter of the fluid spill.4. The method as claimed in claim 1, further comprising: receiving abattery notification that a depleted device of the plurality of trackingdevices has to battery power; retrieving and maintaining the depleteddevice; and redeploying the depleted device in the fluid spill.
 5. Themethod as claimed in claim 1, wherein a first subset of the plurality oftracking devices are deployed in leading edges of the fluid spill, asecond subset of the plurality of tracking devices are deployed in acenter of the fluid spill, a third subset of the plurality of trackingdevices are deployed in trailing edges of the fluid spill, and a fourthand fifth subset of the plurality of tracking devices are deployed onthe sideward edges of the fluid spill.
 6. The method as claimed in claim1, further comprising: preemptively deploying one or more trackingdevices at a predetermined distance between a present location of thefluid spill and an expected shoreward landing point along the forecastedtrajectory of the fluid spill; and monitoring a preemptive location ofone or more tracking devices to obtain an early indication a futurelocation of the fluid spill.
 7. The method as claimed in claim 1,wherein monitoring the geographic location of each tracking device ofthe plurality of tracking devices to track the movement of the fluidspill over a period of time further comprises: dynamically determiningthe overall extent of the plurality of tracking devices using a concavehull polygon to approximate the location of the fluid spill, wherein thefluid spill comprises one or more of an oil fluid, a chemicalcomposition fluid, and a hydrocarbon-based fluid; dynamically averagingthe position and velocity of the plurality of tracking devices withinthe concave hull polygon to produce a plurality of fluid spill vectorsof a location of the fluid spill over time; and enabling the pluralityof fluid spill vectors to be retrieved front a spatial data repositoryto determine the forecasted trajectory of the fluid spill.
 8. The methodas claimed in claim 7, further comprising: identifying a wayward deviceof the plurality of tracking devices that is outside a perimeter of thefluid spill by performing an automatic statistical comparison of theplurality of fluid spill vectors; and redeploying the wayward deviceinside the perimeter of the fluid spill.
 9. The method as claimed inclaim 1, farther comprising: receiving an impact warning notificationthat one of the plurality of tracking devices is within a predetermineddistance of a critical location; and deploying spill response assetsbased on the impact warning notification.
 10. The method as claimed inclaim 1, further comprising: monitoring locations of a plurality ofvessels involved in a fluid spill response using a combination ofvessel-tracking devices and automatic identification system (AIS)transponders.
 11. A method to track movement in a marine environment,the method comprising: associating a plurality of tracking devices witha fluid spill event; deploying the plurality of tracking devices in afluid spill, each tracking device of the plurality of tracking devicestransmitting a geographic location of the tracking device to a dataprocessing satellite; monitoring the geographic location of eachtracking device of the plurality of tracking devices to track themovement of the fluid spill over a period of time; determining aforecasted trajectory of the fluid spill based on the movement of thefluid spill over the period of time; adjusting a spill response based onthe forecasted trajectory; monitoring a velocity of each tracking deviceof the plurality of tracking devices; automatically calculating anaverage velocity of the fluid spill based on the velocities of theplurality of tracking devices; and transmitting a sea-conditions warningnotification when the average velocity changes by a predeterminedpercentage.